is 2 3715477 - 1
has 1118471 decimal digits
takes 0.390 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L7C95856B41CFB137double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27064.312268.5714 %140000007000000007.823910.2459 %72.136271.7916 %
Target2640.958065.6250 %2200022500000.02182.1072 %0.979866.3493 %
Difference+6+63.3543+2.9464 %+13978000+697750000+7.8021+8.1387%+71.1564+5.4422 %

Known prime factors (1 factor, 81.6 bits, 0.00219617% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
371547736605890908586378685979132581.598492613612042092828
22 × 3 × 7 × 31 × 167 × 353 × 3209033507
2021-10-033533209033507256,42826.62649.730

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-06Carsten Kossendeymother20000265000--0.0051.778%
2012-12-12Squeeky_SquirrelT7500_2200245000771750012--0.0996.018%
2021-05-18axnManual testing14000000700000000--7.82415.226%
2022-03-04JossManual testing9000090000--0.0141.459%
2022-03-22JossManual testing100000100000--0.0151.541%
2022-05-24JossManual testing100000130364850--1.3028.109%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1997-12-04ANONYMOUSv4_computers212600.021
2009-03-06S485122USB-A2602610.041
2011-04-17Grant McCrackenhome2612620.083
2012-04-19GrunwalderGIMPManual testing212630.429
2016-02-23Mark RoseManual testing2622630.264
2015-01-22VictordeHollanderManual testing2632651.534
2016-02-24ramgeisManual testing2652662.011
2016-10-31Gordon SpenceManual testing2662674.022
2019-01-21TJAOIManual testing2672688.045
2020-12-14axnManual testing26826916.09
2021-03-08axnManual testing26927032.18


ECM factoring results:
Total ECM effort:3.033 GHz-days
Estimated T-Level:4.071
DigitsB1CompleteFacMiss
20110000.81444.304%
25500000.07592.746%
302500000.00599.526%


ECM Summary

B1B2factorcurvesGHz-days
500005000000192.686
50000675000020.347


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-03-31ANONYMOUSv4_computers7C95856B41CFB1370.390
1999-10-29foxkidv4_computers7C95856B41CFB1370.390


PRP results:
dateuseridcompidcofactorsres64
2021-10-08ATHec2-PRPCFDC
3660589090858637868597913
B32EE91093D024D8


CERT results:
dateuseridcompid
2021-10-08Team_InspectorHorn


P-1 factor-bounds graph:
B1 = 14000000, B2 = 700000000 (P-1 stage 2)
B1 = 14000000 (P-1 stage 1)
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 245000, B2 = 7717500 (P-1 stage 2)
B1 = 245000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
107
108
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
270
269
268
267
266
265
263
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=4.07 ~= -3-bit
250
260
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290
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Last modified: 2024-03-13T02:15:48+00:00